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Design of Compact Quad-Frequency Impedance Transformer Using Two-Section Coupled Line

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5 Author(s)
Yan-Fu Bai ; Nat. Key Lab. of Antennas & Microwave Technol., Xidian Univ., Xi''an, China ; Xin-Huai Wang ; Chang-Jia Gao ; Qiu-Lin Huang
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This paper presents a compact quad-frequency impedance transformer that is composed of a two-section coupled line to achieve ideal impedance matching at three arbitrary frequencies and a related frequency. The exact closed-form equations and design procedures are given based on strict theoretical analysis. After demonstrating the bandwidth performance and symmetry properties of different impedance transform ratios, we fabricated a circuit to show the validity of practical applications. Good agreement between the measured data and anticipated results is achieved.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:60 ,  Issue: 8 )